diff --git a/packages/components/slider/style/index.less b/packages/components/slider/style/index.less
index 2d19c90a6..cc46f2b98 100644
--- a/packages/components/slider/style/index.less
+++ b/packages/components/slider/style/index.less
@@ -8,6 +8,7 @@
 .@{slider-prefix} {
   position: relative;
   box-sizing: border-box;
+  flex: 1;
   height: 12px;
   margin: 10px 6px;
   padding: 4px 0;